Preparation And Performance Of Multifunctional Organic Graphene-reinforced Composite Coatings

Complex marine environment has required superior functionalization and durability for coating protection on the metal surface,and the discovery of two-dimensional materials such as graphene provides new opportunities for exploiting the novel functional coating.Graphene is regarded as the the thinnest corrosive protective layer due to its one-atom-thick structure and impermeability.Stable sp²-hybridized structure can establish the physical barrier between metal and corrosive media to prevent its diffusion and penetration.However,high aspect ratio and strong interlayer interactions of graphene lead to aggregation and defects in the polymeric coating,resulting in the damaged barrier performance.Aiming at promoting the research and application for graphene in the field of marine corrosion protective coating,this paper has started from achieving the efficient dispersion of graphene in liquid-phase and organic resin,proposed two strategies to study the anticorrosion,wear resistance and antibacterial property of graphene-hybrids organic composite coating,including conducting polymer-intercalated graphene and dopamine-decorated graphene.The main contents of this paper include the following aspects:（1）Hydrophilic polypyrrole nanoparticles have been synthetized via micro-emulsion polymerization,and the efficient dispersion（5 mg/mL）of graphene in water has been achieved on the basis ofπ-πinteraction between them and ultrasonic exfoliation.The anti-corrosion performance has been investigated via preparing graphene/waterborne epoxy composite coating.This work reveals that polypyrrole-intercalated graphene exhibits a good dispersion in the aqueous coating and takes the synergistic effect on protective property.The addition of rarely 0.5 wt%graphene can endow coatings with superior anti-corrosion performance.（2）Poly（2-aminothiazole）has been synthetized to exfoliate graphene in organic solvent and solvent-based resin via simple radical polymerization,and the corrosion and wear resistance of long-term composite coating has been studied.A few loading of well-dispersed graphene(PAT-G_0.5%)in epoxy coating can remarkably improve its corrosion and wear resistance:coating exhibited the superior barrier property during the immersion of 80 days and reduced the wear rate by 69.48%relative to pure epoxy coating.（3）Pre-intercalator composed of dopamine derivative and tetraaniline has been synthetized to initiate the dopamine self-polymerization decorating on the graphene surface.Composite coatings have been prepared to investigate the anticorrosion and antibacterial performance.Composite coating with dopamine-decorated graphene exhibited the preferable corrosion protection due to the increased interfacial bonding,and its bacterial inhibition is higher than the coating with only graphene.